DE102012218285A1 - Device and method for creating a foundation and foundation - Google Patents

Abstract

The invention relates to a device (1) and a method (100) for creating a foundation (10) in the ground (8) and a corresponding foundation (8). In order to allow a foundation (10) to be created in the ground (8) which does not pollute the environment excessively and which is safe, fast and cost-effective, it is proposed to drill (101) with several drill strings (3), preferably at the same time and in parallel with the axis, A drill area (6) determined by a drill head (5) of one of the several drill strings (3) partially overlaps with at least one drill area (6) of an adjacent one of the several drill strands (3), a continuous one, the plurality of drill strands (3) jointly enclosing space (7) between the several drill strings (3) and the ground (8) results in introducing fixation material (9) into the space (7) and the several drill strings (3) with the fixation material (9) to create the foundation fix.

Description

The present invention relates to a device and a method for creating a foundation in the ground and a corresponding foundation.

One area that is particularly concerned with equipment and methods for creating foundations that allow foundations or foundations for structures in a technically safe and fast manner is offshore.

In built in the sea structures (offshore structures), different construction forms such. As rigid structures, compliant constructions and floating structures are distinguished.

The technical issue dealt with here relates primarily to rigid structures such. As steel platforms, jack-up or heavyweight platforms. In particular fall in this area so-called tower structures (such as wind turbines), which differ in particular by their high, slim design of the aforementioned construction methods.

Due to current developments in the field of energy supply such. As the planning and construction of additional, large offshore wind farms comes here in particular an environmentally friendly, safe and cost-effective Fundamenterstellung immense importance in the realization of the above projects.

Rigid offshore structures must be anchored to the ground in one way or another to ensure adequate stability against currents, ice and waves, and wind. In known techniques, the types Monopile, Tripod, Jacket, Saugrohrgründung and heavyweight foundations can be distinguished as foundation variants.

Characteristic of the three variants mentioned above is the use of one or more "piles" to which the later structure is anchored. The diameter and length of these piles depend on the design requirements and the respective geological conditions at the place of collection. Common diameters are between about 1.5 m and 5.0 m for lengths of joints in the seabed of more than 50 m.

A common procedure for introducing such piles in unconsolidated soil (eg sand) is the so-called piling method. This is a relatively fast and cost-effective, but the construction of the environment highly burdensome (sound emissions with sound pressure levels up to 200 dB). Furthermore, it is disadvantageous that a piling process often has to be stopped if the pile encounters an obstacle during installation (stone layers, blocks, hard layers).

Alternatively, piles can be introduced by drilling into the seabed, the piles are often introduced only after the completion of the borehole (which is usually created in the rotary Spülbohrverfahren) as finished piles in the borehole. Subsequently, the annulus between the pile outside and the borehole wall is pressed with a suitable binder. As a result, a frictional connection between the bored pile and the borehole is achieved. In one variation, drilling is through a hollow post following the drill bit while drilling down, recovering the drill bit through the hollow post.

The known drilling methods also typically allow foundation in very solid soils or soils with obstacles such as stones and blocks.

Although the known drilling method has distinct ecological and geological advantages over the known piling method, it is considerably more time-consuming and cost-intensive.

The aim of the present invention is to provide a device and a method for creating a foundation in soil, which avoid the disadvantages of the known approaches and in particular allow creation of a foundation in the ground, which does not burden the environment unduly and safely, quickly and cost-effectively is. The aim is also to provide an appropriate foundation.

A first aspect of the invention relates to a device for creating a foundation in soil, with a drilling device, which is designed for receiving and operating a plurality of drill strings, in particular for simultaneous and paraxial operation, and a pumping system, which is for supplying drilling fluid (especially for solving soil / cuttings at the working face and for discharging drilled material from the borehole) for the drill strings and fixing material, wherein the drilling apparatus is configured so that in operation in each case by a drill head of one of the plurality of drill strings determined drilling area with at least partially overlapping a drilling area of an adjacent one of the plurality of drillstrings, with a continuous space between the plurality of enclosing the plurality of drillstreads Drill strings and the ground results, and the pumping system for supplying fixing material in the space for fixing the plurality of drill string is designed as a foundation.

Another aspect of the invention relates to a method for creating a foundation in soil comprising the steps of: drilling with multiple drill strings, particularly simultaneous and paraxial drilling, each having a drilling area defined by a drill bit of one of the plurality of drill strings with at least one drilling area of an adjacent one of the plurality Partially overlapping drill strings, resulting in a continuous, the plurality of drill strings together enclosing space between the plurality of drill strings and the soil, supplying fixing material in the gap, and fixing the plurality of drill strings with the fixing material to create the foundation, wherein the preparation of the foundation preferred a separation of a drilling device used for operating the drill string from the drill strings comprises.

Another aspect of the invention relates to a foundation in the ground, wherein the foundation comprises a plurality of drill strings, which are introduced by drilling with the plurality of drill strings in the ground, and a fixation, which fixes the drill strings in the ground, wherein the drilling is carried out such that partially overlapping a well region defined by a well head of one of the plurality of drill strings with at least one well portion of an adjacent one of the plurality of drill strings and providing a continuous space between the plurality of drill strings and the ground coextensive with the plurality of drill strings, the fixture at least partially filling the gap.

The overlapping of the drilling areas can be achieved in an advantageous manner by a vertically staggered arrangement of the drill heads, although other approaches to achieve an overlap are not excluded. Another possibility is, for example, to design the drill heads in such a way that the drill head does not fill the entire drill area (eg, the drill head could essentially only be designed as a semicircle, so that drilling with adjacent drill heads, which are correspondingly coordinated with one another) in that one drill head in each case engages in the part of the adjacent drilling area which is not filled by the adjacent drill head, likewise leads to an overlap.

The enclosure of the drillstrings through the gap is to be understood as meaning that the space bounded on one side by the drillstrings and on the other hand by the outer walls of the borehole (resulting from a plurality of overlapping sub-boreholes) directly encompasses the drillstrings insofar. From another point of view, the drillstrings extend into and through the gap, which in this view is defined only by the outer walls of the borehole (resulting from a plurality of overlapping sub-boreholes). In this other approach, the indication that, for example, fixing material fills the interior is understood to mean that the fixing material fills the portion of the space that is not already filled by the drillstrings (although typically in the interior of the drillstrings due to supply of the fixation material also fixing material will be present through the drill strings). In this approach, it can also be said that the gap (or the fixing material introduced therein) connects adjacent drillstrings with each other.

According to the present invention, a drilling method is used instead of the sound-intensive ramming, wherein the drilling process by preferably annularly arranged, axially parallel drill string with a relatively very small drill head (compared to the diameter of the foundation) takes place in one operation and the drill strings after reaching the target depth in be embedded in the surrounding soil. The soil inside the ring borer remains in place. The active drilling process can handle hard to very hard ground formations as well as single obstacles in the foundation area.

The advantages of the present invention are particularly in the aspects of ecology (minimum noise emissions in building construction, minimal soil replacement / excavation required), safety & risk (effective management of obstacles, for the offshore area reduced execution risk due to short residence times), technology (optimal integration of the structure into the ground, easy adaptation of the method to different diameters and depths) and costs (high working speed with short dwell times, in particular offshore, "recycling" of drill pipes, which would no longer be usable, for example, for gas or oil drilling operations ).

Features of advantageous embodiments are defined in particular in the subclaims. The particular embodiments or embodiments described for each aspect of the invention are also to be considered as embodiments or embodiments of other aspects of the invention.

In one embodiment of the invention, the device has a guide element for relative spacing and guidance of the drill strings, wherein the guide element is preferably arranged in the intermediate space during operation, in particular in the region of the drill heads of the drill strings.

The guide element serves to guide the drill strings and in particular to avoid a desired relative divergence of the drill string or drill heads, so that in a controlled manner the gap results from the overlapping of the drilling areas of the drill heads.

The drill strings may be provided with receptacles (eg in the form of retaining rings) on which the guide element can rest or be supported, wherein in addition the weight of the guide element acts on the drill strings and thus on the drill heads. The guide element can also rest on the (in particular upper) drill heads, but preferably with a friction-reduced intermediate element, for. B. Teflon.

In a further embodiment of the invention, the drilling device is designed for an opposing drive of drill strings, in particular for an opposing drive of respectively adjacent drill strings.

In particular, adjacent drill strings each operated in opposite directions, occurring during drilling torques compensate basically, so that the arrangement with the plurality of drill strings substantially no overall torque results that would be absorbed by the drilling direction.

Drill strings, which are typically designed for a right-handed drilling could possibly solve in an opposite, so left-handed drilling in the joints, so that an increased reliability is given when the drill strings are secured against loosening due to an opposite operation, in particular by Welding or gluing.

In a further embodiment of the invention, the device has a pressure device for effecting a pressure force acting in addition to the force of gravity on the drill strings.

The drilling device and the drill strings themselves (including the drill heads and possibly the guide element) cause by their weight force a pressure on the working face of the drill heads. In particular, when the drill strings and bits are conventional oil and gas well drilling and drilling heads (which may be advantageously used for the foundation of the present invention after being discarded from normal operation), it is possible that the already applied weight force is insufficient for a desired drilling performance. In underwater use also results in a reduction of the load by the buoyancy in the water. For example, to achieve the fist value of 5 kN per inch of drill head diameter (with 60 drill bits of 12 "diameter, this results in as much as 3,600 kN), it may therefore be advantageous to provide a pressure device to improve drilling performance.

Advantageously, the pressure device can be applied to a tube of tube elements which are connected to one another in a tension-resistant and pressure-tight manner (see, for example, US Pat. DE 10 2005 021 216 A1 ), which in turn presses on the boring device, which passes the pressure on the drill heads over the drillstrings. In this tube advantageously provided for the operation of the drilling device and the pumping system supply lines are guided, which are protected in particular in the offshore area through the pipe from exposure to the sea.

The pressure device, for example, as a terminal with pressure cylinders (see EP 2 013 438 B1 ) or in the form of a "chain drive". In particular, the terminal can also be designed here as a torque brake to accommodate possibly occurring during drilling torques.

As stated previously, the present invention can be used particularly advantageously in the offshore sector, ie for foundations in marine or seabed. However, the invention is not limited to offshore and can also be used on land.

In a further development of the above embodiment of the invention, the pumping system has a pump unit for supplying ambient water as drilling fluid, wherein the pumping unit preferably comprises one or more pumps for supplying ambient water as drilling fluid, which can be used at the sea or lake bottom.

Sea or seawater is available in large quantities in an offshore application and can be readily recovered for use as a drilling fluid.

In a further development of the abovementioned embodiment, the pumping system has a pumping device for supplying a suspension, in particular a bentonite suspension, as a drilling fluid, wherein the pumping system preferably also has a receiving device for recovering suspension that emerges during drilling and designed for the treatment and reuse of recovered suspension.

If the sea water has only unsatisfactory properties as a drilling fluid, this can be improved by using a suitable suspension, as is known from other drilling techniques, whereby the suspension can be recovered in a manner known per se for treatment.

In a further development of the stated embodiment, the device comprises a distributor device for removing drilling cuttings and / or soil emerging during drilling, in particular using a water flow that can be generated by the distributor device.

The present invention already allows to create a foundation with very little excavation. However, even with large drilling depths, a comparatively large amount of drilling material can nevertheless result, which would collect in the area around the borehole (s). In order to avoid or reduce such a collection of soil and / or cuttings, the device may in particular be equipped with one or more nozzles and / or one or more pressure propellers that generate a flow of the ambient water, taken with the cuttings and soil and is distributed. Another possibility is to suck the material emerging from the borehole and intermediately store or deposit it at a suitable location.

In a further embodiment of the invention, the intermediate space in plan view has a linear or star-shaped cross-section and / or encloses an inner region, in particular in ring form.

When enclosing an inner region through the intermediate space results in an arrangement of remaining in the soil drill string, which largely corresponds to a hollow tube, which is introduced into the soil. In addition, a further part of the foundation can be provided in the enclosed inner area, so that a space as an inner ring surrounds a first inner area and in turn is enclosed with a second inner area by a further space as an outer ring.

Preferably, the operation of the drill string according to the present invention takes place simultaneously. However, it is also possible that the drill strings are operated "in groups" over two or more interconnected subunits of the device, so that the depth difference of the drill heads of the groups is variable. This would result in drilling with the "lower" drill heads (with the "upper" drill heads at a standstill) and alternate (or even subsequent) drilling with the "upper" drill heads (with the "lower" drill heads at a standstill). Although the apparatus required for this would be higher, but would allow the advantage that with otherwise the same available pressure force a higher pressure force per drill head would be achieved (or at the same pressure force per drill head less Gesamtandruck would be set). In addition, there would be a greater effort in the well stabilization.

A foundation can also be achieved by sequential sinking of the drill strings, although in such a variant, in addition to the greater risk of borehole stability, in particular a significantly higher expenditure of time would occur.

The operation of the drill strings according to the present invention preferably takes place parallel to the axis. However, it is also possible to deviate from an axis-parallel drilling. If, for example, the respective drill string receptacles are also designed for a separate propulsion of the drill strings, the drill strings can be spread apart from one another, if necessary also so far that the drill holes no longer overlap at the end of the propulsion. Alternatively, it may be drilled so that the holes run towards each other.

The drive of the drill strings can be done in different ways. One possibility is to provide a dedicated drive for each drill string, which would preferably also be separately controllable. Another possibility is to provide a common drive for several drill strings, so the driving force generated by the drive is transmitted via suitable means to a plurality of drill strings. It is also possible to provide a common drive for all involved drill strings together. Combinations or intermediate stages between the extremes of the dedicated drive and the common drive are possible.

The present invention can be used to particular advantage in a silt-sand geology, where obstacles can be drilled through and harder layers can not expect significant problems.

In the following, individual aspects and advantageous embodiments of the invention will be explained in more detail with reference to the accompanying drawings. Hereby shows:

1 a schematic representation of an embodiment of a device according to the invention,

2 schematic representations of embodiments of Bohrstrang- or Bohrkopfanordnungen for embodiments of the invention,

3 a schematic representation of a sequence of an embodiment of the method according to the invention, and

4 a schematic representation of an embodiment of a foundation according to the invention in cross section and in supervision.

1 shows a schematic representation of an embodiment of a device according to the invention 1 ,

The device 1 Creating a foundation involves a work platform 22 in the form of a jack-up. The work platform 22 has a lifting device 19 , a drive unit 23 , a control unit 24 and a pumping device 15 on. The pumping device 15 is part of a pumping system 4 , The lifting device 19 holds one end of a push and pull tube 20 , at the other end of a drilling device 2 is arranged. The push and pull tube 20 is with a pressure device 12 coupled, so that the pressure device 12 over the push and pull tube 20 Pressure on the drilling device 2 can exercise. The drilling device 2 is via utility lines 21 from the drive unit 23 and the pumping device 15 provided. The drilling device 2 is under water 14 and is also equipped with a pump unit 13 Mistake. The drilling device 2 has several drill strings 3 on, each one a drill head 5 exhibit. The drill strings are arranged axially parallel and in such a way that the drilling areas 6 the drill heads 5 overlap, with the drill heads 5 are arranged vertically offset from each other. The arrangement of drill strings 3 and the drill heads 5 allows drilling into the ground 8th in such a way that there is a gap 7 yields the drillstrings throughout 3 in the ground 8th encloses. In the lower part of the drill string 3 There is also a guide element 11 that is a predetermined distance and a predetermined arrangement of the drill strings 3 ensures. The pumping system 4 with the pumping device 15 is designed to be a suspension of bentonite in seawater 14 through the drill strings 3 and the drill heads 5 and thus in and through the gap 7 to pump. At the exit of the borehole is a receiving device 16 that under the pumping system 4 serves to receive emerging from the wellbore suspension and supply a treatment, so that the suspension can be reused. Alternatively or in addition to the suspension operation, the pump unit 13 be used to ambient water 14 as drilling fluid in the drill strings 3 to pump. The drilling device 2 also has pressure propellers 17 as distribution devices 17 Remove the drilling material, which emerges during drilling from the well, from the area of the borehole by a water flow generated by them.

2 shows schematic representations of embodiments of Bohrstrang- or Bohrkopfanordnungen for embodiments of the invention.

2a shows an annular arrangement of drill strings or in a gap 7 resulting in a diameter of about 2 m using 24 Drill heads having a respective diameter of 300 mm. The gap 7 encloses an interior area here 18 ,

2 B shows another annular arrangement of drill strings or in a gap 7 results, which has a diameter of about 6 m using 60 drill heads with a respective diameter of 300 mm. The gap 7 also encloses an interior area here 18 ,

2c shows a combination of the arrangements, which in the 2a and 2 B are shown, bringing an inner space 7 and an outer space 7 result.

2d shows a star-shaped arrangement, which consists of a combination of 6 drill string groups, in each of which 8 drill strings are arranged in a line next to each other.

2e shows a representation to illustrate the overlapping of drilling areas 6 adjacent drill heads. The respective to a drill string 3 or the corresponding drill head (not shown here) associated drilling area 6 results in the simplest way through the drilling surface of the drill head. An easy way to overlap drilling areas 6 to achieve with conventional drill heads is to offset the drill heads in the vertical direction against each other, with a sufficient distance of the drill head edge to the adjacent drill string 3 to pay attention. 2e also shows the guide element 11 , with which the drill strings are kept aligned with each other.

3 shows a schematic representation of a sequence of an embodiment of the method according to the invention 100 ,

In a first step, drilling takes place 101 with several drill strings.

From a lifting device on a working platform a drilling device z. B. on a steel cable (alternatively, other ways for supporting / discharging the drilling device can be used, for example, by boring bar o. An annular bored pile is attached to the drilling device. The bored pile consists of annularly arranged, axially parallel arranged drill strings, at the lower end of each drill head is located. The drilling device is connected via a supply bundle with an energy and control unit on the work platform. In addition, there is a mixing and pump unit on the work platform.

The drilling apparatus comprises drill string drives, clamping devices (and / or screwing devices), swivel and feed lines together. For example, each drill string can each have its own drill string drive, its own clamping device, its own swivel and its own supply line, although also several drill strings can be summarized. All power and control lines of Bohrstrangantriebe and the clamping devices and all leads are connected to the centrally arranged supply bundle.

In the lower part of the drill string a ring guide is provided. This includes and fixes the drill strings in the intended, annular arrangement and generates additional pressure force on the drill heads.

Shortly before the drill heads reach the seabed at the lower end of the drill string, the drill string drives are switched on. It is preferably provided, in each case adjacent drill strings to rotate in opposite directions, so that during the drilling process resulting torques can almost compensate and thus no significant rotational movements / moments are transmitted to the drilling device.

At the same time as the drill string drives, the pumps in the mixing and pumping unit on the working platform are set in motion. In a preferred variant, seawater is removed as the medium and fed to the suction tanks in the mixing and pumping unit. This seawater is now pumped by the pumps of the mixing and pumping station through an appropriate (hose) line within the supply bundle to the supply lines of the drilling device and there further through the swivel and possibly the Bohrstrangantriebe in the drill strings and finally to the drill heads. The seawater escapes from the drill heads and releases there - together with the mechanical release work of the drill heads - the pending soil. The mixed with ground seawater now flows in the annulus between the drill strings and the hole to the seabed. There, the seawater laden with soil mixes with the seawater in the vicinity of the drilling apparatus and the ocean current carries away the soil and deposits in the wider surroundings of the drilling apparatus. In a preferred embodiment, this process is additionally supported by appropriately arranged propellers on the drilling device.

The drilling process 101 is continued until the drill heads have reached their intended final position in the ground. Now the drill string drives are switched off, so that the rotation of the drill string stops.

At about the same time, a suitable suspension is fed to the pumps in the mixing and pumping unit instead of the seawater (eg twilight), thus providing the step of feeding 102 starting from fixing material. The suspension is then pumped by the pumps of the mixing and pumping station through a corresponding (hose) line within the supply bundle to the supply lines of the drilling device and there further through the swivel and possibly the Bohrstrangantriebe in the drill strings and finally to the drill heads. At the drill heads, the suspension enters the annulus and continues to flow upwards until it finally exits the seabed. Now the pumping process is stopped.

Parallel to the beginning of curing 103 the suspension the drill string drives are separated by means of the clamping devices of the drill strings (step 104 ) and the drilling device then lifted slightly from the lifting device on the work platform and, if necessary, also slightly offset laterally. Then, by re-pumping seawater, the suspension still contained in the corresponding (hose) line within the supply bundle as well as the supply lines and the swivel of the drilling device can be displaced, so that no hardening process can occur here and, as a consequence, congestion.

The suspension in the annulus cures with time (eg, within a few hours) and then firmly bonds the drillstrings to the surrounding soil (step 103 ).

After this has been done, a corresponding connection device can be attached to the upper ends of the drill strings protruding from the seabed (step 105 ). This connection device will later with parts or the Whole of the offshore structure to be built.

4 shows a schematic representation of an embodiment of a foundation according to the invention 10 in cross section ( 4a ) and in supervision ( 4b ). The foundation 10 includes several drill strings 3 , each with their drill head 5 in the ground 8th are introduced. The introduction is done so that the drillstrings 3 together enclosing space 7 has resulted, with this gap 7 here is designed annular and an interior 18 encloses. The gap 7 is with a fixing material 9 filled that after curing the drillstrings 3 in the ground 8th anchored so that the founding 10 results. In 4a are also parts of the guide element in cross section 11 shown here the drillstrings 3 enclose. In 4b is in place of a drill string 3 and the corresponding part of the gap 7 or the fixation 9 the drilling area 6 the corresponding drill head (not shown) illustrated, wherein also the overlapping with adjacent drilling areas (not shown) can be seen.

In the following, another embodiment of the method for creating a foundation is outlined.

Several drill strings are arranged in a ring and drained by a lifting device in the ground, the direction of rotation of adjacent drill strings is arranged in opposite directions (for torque compensation) and the ring shape is fixed by a guide ring arranged as far as possible. The cut surfaces of the drill bits overlap, so that a "continuous" annular gap is produced.

Drill pipes and drill heads are from the oil and gas industry (eg 5 '' boom, 12.1 / 4 '' chisel), where all parts can be purchased inexpensively as "scrap". The drill pipe and chisel remain in the ground and form the skeleton of the foundation.

Seawater is provided as the drilling fluid, whereby the supply takes place via each individual drill string. The pumps themselves are placed directly at the top of the drill string. The pumping rate is chosen so high that the sinking rate of the cuttings is exceeded.

After drilling out the ring drill twilight is pumped through the drill strings and fills the annulus and the drill strings completely. Subsequently, the auger drives are decoupled from the drill strings and salvaged.

At the heads of the drill strings, a connecting plate is attached to the offshore structure.

An apparatus for carrying out the above embodiment may be configured, for example, as follows: On a work platform (eg, a jack-up or a jack-up) are a lifter, power container, a control container and a Dämmertank with Dämmerpumpen. The lifter holds connecting pipes, through which energy and control cables as well as a twilight line are led to a drilling deck. A pusher connected to the work platform pushes or pulls the connecting tubes and thereby applies additional forces provided for the drilling operation to the drill string and the drill heads via the drilling deck. A guide ring secures the drill pipe and additionally provides pressure to the drill heads.

For an implementation, it can be estimated that depths of foundation (from the ground) of 10 to 100 meters are readily possible for diameters of 1 to 5 meters (or more). As a drilling speed is about 1 m / min, regardless of the diameter of the foundation realistic, with the damming time depending on the pump capacity 5 minutes are assumed.

LIST OF REFERENCE NUMBERS

1

Device for creating a foundation

2

drilling

3

drill string

4

pumping system

5

wellhead

6

drilling

7

gap

8th

ground

9

fixing material

10

founding

11

guide element

12

pressure device

13

pump unit

14

environment water

15

pumping device

16

cradle

17

distributor

18

interior

19

hoist

20

Push and pull tube

21

supply lines

22

working platform

23

drive unit

24

control unit

100

Procedure for creating a foundation

101

Drill

102

Feeding fixation material

103

Fix

104

Separate

105

Attaching an end plate

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102005021216 A1 [0029]
• EP 2013438 B1 [0030]

Claims (11)

Contraption ( 1 ) to create a foundation ( 10 ) in soil ( 8th ), comprising: a drilling device ( 2 ) used to receive and operate multiple drill strings ( 3 ), in particular for simultaneous and paraxial operation, and a pumping system ( 4 ) used to supply drilling fluid for the drill strings ( 3 ) and fixing material ( 9 ) is configured, wherein the drilling device ( 2 ) is configured so that in each case one by a drill head ( 5 ) one of the several drill strings ( 3 ) certain drilling area ( 6 ) with at least one drilling area ( 6 ) of an adjacent one of the plurality of drill strings ( 3 partially overlapped, with one continuous, the several drill strings ( 3 ) common space ( 7 ) between the several drill strings ( 3 ) and the ground ( 8th ), and the pumping system ( 4 ) for supplying fixing material into the intermediate space ( 7 ) for fixing the plurality of drill strings ( 3 ) as founding ( 10 ) is configured. Contraption ( 1 ) according to claim 1, with a guide element ( 11 ) for the relative spacing and guidance of the drill strings ( 3 ), wherein the guide element ( 11 ) preferably in operation in the intermediate space ( 7 ), in particular in the area of the drill heads ( 5 ) of the drill strings ( 3 ). Contraption ( 1 ) according to one of the preceding claims, wherein the drilling device ( 2 ) to an opposing drive of drill strings ( 3 ) is configured, in particular to an opposing drive each adjacent drill strings ( 3 ). Contraption ( 1 ) according to one of the preceding claims, with a pressure device ( 12 ) in addition to gravity on the drill string ( 3 ) acting pressure force. Contraption ( 1 ) according to any one of the preceding claims, wherein the device ( 1 ) to create a foundation ( 10 ) in the sea or lake ( 8th ) is configured. Contraption ( 1 ) according to claim 5, wherein the pumping system ( 4 ) a pump unit ( 13 ) for supplying ambient water ( 14 ) as a drilling fluid, wherein the pump unit ( 13 ) preferably one or more pumps for the supply of ambient water ( 14 ) as drilling fluid, which can be used at the sea or lake bottom. Contraption ( 1 ) according to claim 5 or 6, wherein the pumping system ( 4 ) a pumping device ( 15 ) for supplying a suspension, in particular a bentonite suspension, as a drilling fluid, wherein the pumping system ( 4 ) further prefers a receiving device ( 16 ) for the recovery of emerging during drilling suspension and is designed for the treatment and reuse of recovered suspension. Contraption ( 1 ) according to one of claims 5 to 7, with a distributor device ( 17 ) for removing drill cuttings and / or soil emerging during drilling, in particular using one of the distribution device ( 17 ) producible flow of water. Contraption ( 1 ) according to one of the preceding claims, the gap ( 7 ) has a line-shaped or star-shaped cross-section in plan view and / or an interior area ( 18 ) encloses, in particular encloses annular. Procedure ( 100 ) to create a foundation ( 10 ) in soil ( 8th ), with the steps: drilling ( 101 ) with several drill strings ( 3 ), in particular simultaneous and paraxial drilling ( 101 ), one each through a drill head ( 5 ) one of the several drill strings ( 3 ) certain drilling area ( 6 ) with at least one drilling area ( 6 ) of an adjacent one of the plurality of drill strings ( 3 partially overlapped, with one continuous, the several drill strings ( 3 ) common space ( 7 ) between the several drill strings ( 3 ) and the ground ( 8th ), feeding ( 102 ) of fixing material ( 9 ) into the space ( 7 ), and fixing ( 103 ) of the several drill strings ( 3 ) with the fixing material ( 9 ) for the creation of the foundation ( 10 ), whereby the creation of the foundation ( 10 ) preferably a separation ( 104 ) one for operating the drill strings ( 3 ) used drilling device ( 2 ) from the drill strings ( 3 ). Founding ( 10 ) in the ground ( 8th ), the founding ( 10 ) comprises: a plurality of drill strings ( 3 ) by drilling with the multiple drill strings ( 3 ) in the ground ( 8th ) and a fixation ( 9 ), the drill strings ( 3 ) in the ground ( 8th ), wherein the drilling is done so that one of a drill head ( 5 ) one of the several drill strings ( 3 ) certain drilling area ( 6 ) with at least one drilling area ( 6 ) of an adjacent one of the plurality of drill strings ( 3 ) partially overlaps and a continuous, the multiple drillstrings ( 3 ) common space ( 7 ) between the several drill strings ( 3 ) and the ground ( 8th ), the fixation ( 9 ) the space ( 7 ) at least partially.

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